Valve-seat.



PATENTED JULY 23, 1907 J. M. HARTMAN.

VALVE SEAT.

APPLICATION FILED SEPT. 3.1904.

INVENTOR:

,7 W.% 7% W X JOHN M. HARTh/IAN, OF PHILADELPHIA, PENNSYLVANIA.

VALVE-SEAT.

Specification of Letters Patent.

lcatented July 23, 1907.

Application filed September 3, 1904. Serial No. 223,199.

To all whom it may concern:

Be it known that I, JOHN M. HARTMAN, residing at No. 227 Gowen avenue,in the city of Philadelphia,

Y State of Pennsylvania, have invented certain new and usefulImprovements in Valve-Seats, whereof the following is a specification,reference being had to the accompanying drawings.

My invention is especially adapted for advantageous use in the valveseats of hot blast apparatus, where the current of air to be controlledfrequently has a temperature of from 1,000 to 1,600 degrees. Asheretofore constructed, the valve seats of this class of apparatus areopen to serious objections, due to irregular expansion and consequentstrain upon the parts.

My present invention is designed to overcome the difficulties found inthe existing types of these structtues, and to that end it consists,primarily in a divided organization of the valve seat, the parts beingso related as to minimize strains or unequal action while affording thenecessary stability of the seat. By this improved construction, I amenabled to obtain the above mentioned chief desideratum as well as theminor and more obvious advantages of rendering the parts readilyreplaceable in the event of injury.

In the accompanying drawing Figure I represents a vertical transversesection through the valve seat and immediately adjacent parts, showingthe construction of the two part seat and its retaining devices. Fig.II, is a partial sectional view showing, on an enlarged scale certaindetails of the seat-rest and seating-ring.

In said drawings, 1, 2, represent the two annular heads or holders forthe valve seat, mounted in the usual manner in the wall of the chamber.Said heads are provided with bolts 3, arranged at suitable intervals,whereby they may be clamped in proper relation to the intervening seat.

The valve seat proper comprises two members, viz: an outer ring 4, whichI term the seat-rest, and the inner ring 7, which I term the seatingring. The seat-rest 4, may be of cast iron and has upper and lower facesof considerable radial extent so as to properly bear the strain of theclamping devices 1, and 2. Said seat-rest has at its lower portion aninwardly projecting horizontal flange or step 5, and the inner faceabove said step recedes slightly as shown at 6, so as to facilitate theinsertion and withdrawal of the seating-ring. Resting upon the said step5, is the substantially horizontal seating-ring 7, preferably formed ofbronze and having the configuration shown. The interior is hollow, asindicated at 8, and the upper surface of the cavity is inclined upwardlyin an outward direction as indicated at 9. The periphery of the outerwall of the seating-ring 7, is substantially vertical throughout itsupper portion, but is preferably flared outwardly around its lowerportion to a slight extent, as indicated at 14, in Fig. II. The verticalheight of this outer wall of the seating ring is not greater than theheight of the wall of the seat-rest above the step 5, so that the directpressure of the clamping heads 1, and 2, is distributed largely upon theseat-rest 4.

Suitable connections for affording water circulation within the interiorof the seating-ring 7, are provided, one of such connections beingindicated in the drawing at 10. The upper portion of the inner peripheryof the seating-ring has of course the usual configuration, indicated at11, for properly seating the valve 12. When the two part seat,consisting of the iron seat-rest 4, and bronze seating-ring 7, isclamped in position by means of the heads 1, and 2, a limited annularspace 13 is afforded between the outwardly projecting lower portion ofthe exterior wall of the seating-ring and the inwardly inclined portionof the inner wall of the seatrest above the step 5. This annular spacepermits expansion of the bronze seating-ring with relation to thesomewhat cooler seat-rest, and, as the method of securing the twopermits relative movement without strain, the effect of the relativelyhigher temperature in the region of the seating-ring is properlycompensated. The outward inclination of the top of the cavity within theseating-ring 7, prevents accurnmulation of steam or air in the region ofmaximum heat, so that the water may be maintained in complete contactwith the portion of the cavity which is adjacent to the valveseatingsurface.

Having thus described my invention, I claim:

1. In a valve seat, the combination with an outer seatrest; an innerseating-ring freely mounted within said seat-rest; and means forclamping said seat-rest and seat ring together and securing them to thevalve chamber, while permitting radial expansion of the ring.

2. In a valve seat, the combination with an outer seat rest comprisingan inwardly projecting step on the lower portion of its inner peripheralwall; of an independent seating ring arranged to fit upon said step andhaving a vertical wall of similar height to the wall of the seat rest;and, means arranged to clamp said rest and ring together, substantiallyas set forth. 3. In a valve seat, the combination with an outer seatrest comprising an inwardly projecting step on the lower portion of itsinner peripheral wall; of an independent seating ring arranged to fitupon said step and having a vertical wall of similar height to the wallof the seat rest; means arranged to clamp said rest and ring together,comprising two annular heads fitted upon axially oppositesides of saidring and rest; and, bolts connecting said heads, substantially as setforth.

4. In hot blast 'apparatns, the combination with axially opposed conduitwalls; of annular heads respectively secured to said walls; an annularvalve seat rest independent of said heads and interposed between them; avalve seat ring independent of said rest and heads fitted in said restbetween said heads; and, means connecting said heads arranged tocompress them upon said rest, substantially as set forth.

5. In hot blast apparatus, the combination with a conduit; of asubstantially horizontal valve seat in said conduit comprising a cavitywhose upper boundary inclines upwardly outward; of means arranged toeffect the circulation of a cooling medium in said cavity, substantiallyas set forth.

G. The combination with an annular substantially horizontal valve seatcomprising an annular cavity whose upper boundary inclines upwardlyoutward; of means arranged to efject the circulation of a cooling mediumin said cavity, substantially as set forth.

7. The combination with a substantially horizontal valve seat comprisinga cavity whose upper boundary inclines upwardly outward; of meansarranged to effect the circulation of a cooling medium in said cavity,substantially as set forth.

8. The combination with a substantially horizontal valve seat comprisinga cavity whose upper boundary is higher at its outer portion than at itsinner portion; of means arranged to direct a cooling medium to and fromsaid cavity, substantially as set forth.

In testimony whereof, I have hereunto signed my name,

at Philadelphia, Pennsylvania, this 1st day of September, 1904.

JOHN M. HARTMAN.

Witnesses:

JAMns II.'BELL, E. L. FULLERTON.

